Natalie Portman

You know how sometimes all you can think about is how badly you need a haircut, so you just cancel all your plans and hit the salon? Natalie Portman knows that feeling too. Except the only difference is, she experienced it sometime in between the London and Paris premieres of Thor: The Dark World, and she got to debut the new do on a global stage.

Last week, we decided that we didn’t want to hog the spending spotlight and only fill you in on what we’re buying–so from now on, we’re going to feature a “guest buyer” in addition to our editors. Our first guest? Dana Weiss, the amazing fashion blogger behind possessionista.com. Check out what she and our editors are buying this week–and click through to pick the items up for yourself.

Portman actually had L.A. colorist Tracey Cunningham switch up her ‘do for a role.

“My mom says I’m like a different person,” the Black Swan star, mom to 1-year-old Aleph, told The Hollywood Reporter. “I did it just a couple of days ago.”

“Natalie makes a beautiful blonde!” Cunningham says of the switch-up, which she achieved with Redken’s Blonde Dimensions. “She needed to make the change for an upcoming movie role, so we achieved a gorgeous, multi-dimensional golden honey blonde.” Tell us: Do you prefer Portman as a blonde?

Natalie Portman bares quite a bit in her latest ad for Dior beauty, this appropriately for the new Rouge Dior Nude Lipcolor. The collection includes eight new shades, including a special hue, Grège #169, proceeds from which benefit Portman’s charity of choice, the Free the Children Association. The organization uses leadership training to empower and inspire the world’s youth.

“I chose the color Grège because it’s the one I’d pick to wear myself,” the newlywed actress says in a release. “The number [169] contains different dates that are important to me and my family.” Grège was also the color used to represent Christian Dior’s “New Look” back in 1947.

When Natalie Portman needed a wedding dress appropriate for a traditional Jewish wedding ceremony in California’s chilly Big Sur, the actress called on her friends. Her fashion friends, that is.

A source tells PEOPLE that Portman tied the knot in a dress by Rodarte, the label run by Portman’s longtime pals, sisters Laura and Kate Mulleavy. The frothy white A-line frock, left, was tea length, and featured a sheer overlay that covered the star’s chest and arms. She accessorized the simple gown with nude shoes, a veil and what appeared to be a floral crown.

The actress has been a fan of the young line for several years, wearing Rodarte creations on press tours for The Other Boleyn Girl, Black Swan and for the 2011 Oscars, where she nabbed the best actress statuette.

Portman and dancer Benjamin Millepied wed Saturday night in a moonlit ceremony attended by family (including their 14-month-old son, Aleph) and friends, such as Ivanka Trump and husband Jared Kushner and Macaulay Culkin.

Young, who was named Hollywood’s most powerful stylist by The Hollywood Reporter earlier this year, has created so many gorgeous looks for Black Swan‘s Portman, but one particular ensemble stands out: “It’s her in Givenchy couture at the amFAR Gala in Cannes (above, left) which was in ’08,” Young tells Refinery29.